implement shared memory pool model

src/Model/Pool.php

@@ -0,0 +1,73 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Yoda\Model;
+
+class Pool implements \Yggverse\Yoda\Interface\Model\Pool
+{
+    private string $_namespace;
+
+    private array $_data = [];
+
+    public function __construct(
+        ?string $namespace = null
+    ) {
+        $this->_namespace = __FILE__ . (
+            $namespace ? $namespace : uniqid()
+        );
+    }
+
+    public function get(
+        string $key,
+        int $start = 0,
+        int $count = 0
+    ): ?string
+    {
+        if (isset($this->_data[$key]))
+        {
+            return shmop_read(
+                $this->_data[$key],
+                $start,
+                $count ? $count : shmop_size(
+                    $this->_data[$key]
+                )
+            );
+        }
+
+        return null;
+    }
+
+    public function set(
+        string $key,
+        string $value,
+        string $flags = 'c',
+        int $offset = 0,
+        int $mode = 0644,
+        ?string $encoding = null
+    ): int
+    {
+        if ($this->_data[$key] = shmop_open(crc32($this->_namespace . $key), $flags, $mode, mb_strlen($value, $encoding)))
+        {
+            return shmop_write(
+                $this->_data[$key],
+                $value,
+                $offset
+            );
+        }
+
+        throw new \Exception;
+    }
+
+    public function reset(): void
+    {
+        foreach ($this->_data as $data)
+        {
+            shmop_delete(
+                $data
+            );
+        }
+
+        $this->_data = [];
+    }
+}